Since Dual Disorders expression was used for the first time, the old dilemma between cathegorial and dimensional grew again as a main issue because many authors wondered about its utility. The question was how far we can speak about two different entities, because doing so we are assuming comorbidity instead of a complex syndrome, with different clinical presentations (i.e. Talking about fever and cough instead of pneumonia). Child and adolescence psychiatry uses developmental psychiatry as a very useful tool to understand patients. Syndromes are seen as dynamic as patients. At the same time that patients grow their clinical presentations, evolves new symptoms or signs. We have reviewed retrospectively a group of twenty parents that were named as dual disorders, with different substance abuse but a common path in their childhood; all of them were diagnosed of ADHD and Conduct Disorder. We chose them because of the differences that DSM, ICD and main researchers have about this group, which some consider better described as a Disocial hiperquinetic disorder (ICD) than a AHDH with a conduct disorder associated (DSM), comorbidity again. We agreed with ICD opinion and will discuss how in some way we are somehow as those blind people describing different parts of the same elephant when we talk sometimes about dual. Truth is that opposite dual view or its syndromic treatment developmental psychiatry has all the time underlined the role of reward circuits/executive functions as epigenetic issues, both modulated by gene and environment.